Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fbdbc980dd6e4e…

MALICIOUS

PDF

87.5 KB Created: 2021-03-17 05:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21ef88efce6aaa46d43c1e509e47dad SHA-1: 976022535908df67f6784c97a8f60bf754af7434 SHA-256: a1fbdbc980dd6e4ec4e2363b82b0079d73137a02ca72a0828f92b3ee3dff868a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to 'https://dafemum.ru/wix?keyword=5-6+law+of+sines+practice+worksheet+answers', suggesting a phishing or malware distribution attempt disguised as a worksheet. No scripts were extracted, but the presence of external URLs and the nature of the heuristics indicate a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=5-6+law+of+sines+practice+worksheet+answers
    • http://kegujusotuk.iblogger.org/vehicular_accident_report_sample_letter.pdf
    • http://italywom.space/blue_prism_ad01_certification_dumpseqqj7.pdf
    • http://wevesapawuzu.22web.org/lamamasonur.pdf
    • http://2220202.ru/how_to_subscribe_on_twitch_for_free_with_amazon_prime53gv2.pdf
    • http://fitokapss.xyz/get_followers_for_instagram_2019_apkhx3nz.pdf
    • http://gonzo-3d.com/watchmen_graphic_novel_download86r2x.pdf
    • http://islta.fun/problem_and_solution_text_type_sampleaqwww.pdf
    • http://help-verification.com/lego_dc_comic_superheroes_charactersj9nvl.pdf
    • http://comp-arenda.site/hp_deskjet_2620_price_in_nigeria4bd5s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xupovobejanam/siteduraf.pdf
    • https://s3.amazonaws.com/fifomi/mens_hairdressers_open_near_me_now.pdf
    • https://s3.amazonaws.com/tuxexi/hollywood_animal_movie_tamil.pdf
    • https://s3.amazonaws.com/gapuruxumeg/karni_padi_badmashi_song_md_kd.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/codex_alimentarius_commission_haccp_guidelines.pdf
    • https://s3.amazonaws.com/rebomedug/nexet.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/risora.pdf
    • https://s3.amazonaws.com/levovod/7252266784.pdf
    • https://s3.amazonaws.com/rewepalazamiso/kill_or_get_killed.pdf
    • https://s3.amazonaws.com/moduluzuxikari/ge_roaster_oven_replacement_handle.pdf
    • https://s3.amazonaws.com/wulotugadag/abcdefg_video_song.pdf
    • https://s3.amazonaws.com/senodiw/fabito.pdf
    • http://tuxefefili.epizy.com/clauses_and_sentence_structure_worksheet_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039c.bin
908dcf0a467b34244185275b6599cccec1df58a24c1e0fe570de61c16240a58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 5476 bytes
font_01_sfnt_off00011656.bin
3543e5d9ce98c1c746e7da70516314e6cbbe5c427328f4a9b01b6a8d8ebeaa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 10888 bytes
font_02_sfnt_off00013b44.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B44 16072 bytes

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